Things have changed again in Beastium. Captured beasts have escaped from the Outlands but they have changed. They are now mega-mutants and have come back to Beastium. Kai will need help to battle these new beasts. Will Kai choose the right battle partner to beat the mega-mutants?

Kai Masters is a Border Captain. He must battle beasts to keep Earth safe. There are more beasts in Beastium. Mega-mutants. Kai needs help. He must build a team. He must choose a battle partner. Can Kai and Akin win against the mud mega-mutant? Previously published as Terratoratan.

Only a wall divides Earth from Beastium. The border guards protect the wall and Earth. Kai Masters, border guard and beast battler, is now a captain, and can choose other border guards to help him battle. More beasts have escaped from the Outlands back into Beastium. And now something strange has happened to the pests. Kai will need the help of Border Guard Ying Li and her robotic cat. But will it be enough?

Only a wall divides Earth from the beasts of Beastium. Only a boy and his dogbot defend the wall and protect Earth. Kai Masters. Border guard and beast battler. From the creators of Zac Power comes this fantasy adventure series for boys. With black-and-white illustrations throughout, including double-page graphic novel battle sequences in every book, Boy vs. Beast is the perfect series for 6- to 9-year-olds.

Something strange is happening in Beastium. A new mutant beast is filling the water land with rocks. Will Kai and BC be able to battle the new beast with their new gear? Will Kai battle well enough to prove himself a worthy Border Captain?

All four Battle of the Worlds books in one great value giftbox PLUS an exclusive Border Guard Log Book! The water battle of Aquatan. The rock battle of Terradon. The fire battle of Infernix. The wind battle of Tornados. Packed with adventure and value!

Only a wall divides Earth from the Beasts of Beastium. Only a boy and his dogbot defend the wall and protect Earth. When mud starts to fall from the sky, Kai knows it is time for battle. Kai and his Sludgebot will have to work hard to stop the mud beast...and things are going to get dirty! Kai must use the cool gadgets Bordaria Master Command has given him to defeat the beast and once again protect Earth. Includes two spreads of action-packed graphic illustrations!

Formerly published as Tornados. When a freaky tornado hits, Kai chooses his Astro-Jet Striker to battle the wind beast. Can it win over a wind attack?

When ash starts to fall from the sky, Kai knows it is time for battle. Will his skills and his Jet Drill be enough to stop the volcano beast? Kai will have to dig deep.

The battle against the Beasts of Beastium continues! Only a wall divides Earth from the Beasts of Beastium. Only a boy and his dogbot defend the wall and protect Earth. Kai Masters. Border guard and beast battler! When it starts to snow in the middle of summer, Kai knows it's time for battle. Kai and his robot dog BC3 build their own Sub-Skate to battle the growing ice beast. But will their tools be enough to stop the beast from breaking through the border wall? Can they save the Earth from deep-freeze? Things will need to heat up!